Allow ChromeOS file selection dialog to be shown from shell windows.

chrome/browser/extensions/shell_window_registry.cc

Index: chrome/browser/extensions/shell_window_registry.cc
diff --git a/chrome/browser/extensions/shell_window_registry.cc b/chrome/browser/extensions/shell_window_registry.cc
index 793490188307058cb3fff409f33051ad9e5a778d..d852cffd6354d22834fa87f0a6e6f64f2fd0b099 100644
--- a/chrome/browser/extensions/shell_window_registry.cc
+++ b/chrome/browser/extensions/shell_window_registry.cc
@@ -58,6 +58,17 @@ ShellWindow* ShellWindowRegistry::GetShellWindowForRenderViewHost(
   return NULL;
 }
 
+ShellWindow* ShellWindowRegistry::GetShellWindowForNativeWindow(
+    gfx::NativeWindow window) const {
+  for (ShellWindowSet::const_iterator i = shell_windows_.begin();
+       i != shell_windows_.end(); ++i) {
+    if ((*i)->GetNativeWindow() == window)
+      return *i;
+  }
+
+  return NULL;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // Factory boilerplate